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: Naproxen and demethylnaproxen can be determined fluorometrically in serum and urine after extraction with dichlorethane, and without prior separation. The detection limit of naproxen and demethylnaproxen is below 0,2 mg/l in serum and below 0,5 mg/l in urine. After incubation of urine with beta-glucuronidase/arylsulfatase, most of the conjugated naproxen and demethylnaproxen can be determined.

Fluorometrische Methode zur Bestimmung von Naproxen und Desmethylnaproxen in Serum und Urin